Google\Cloud\Tests\Storage\BucketTest::testComposeThrowsExceptionWithUnknownContentType PHP Method

    public function testComposeThrowsExceptionWithUnknownContentType()
    {
        $bucket = new Bucket($this->connection->reveal(), 'bucket');
        $bucket->compose(['file1.txt', 'file2.txt'], 'combined-files.abc');
    }